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Related Concept Videos

Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
Metabolic States of the Body: The Absorptive State01:25

Metabolic States of the Body: The Absorptive State

During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...

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Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization
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Nutrient timing revisited: is there a post-exercise anabolic window?

Alan Albert Aragon1, Brad Jon Schoenfeld

  • 1Department of Health Science, Lehman College, Bronx, NY, USA. brad@workout911.com.

Journal of the International Society of Sports Nutrition
|January 31, 2013
PubMed
Summary

Nutrient timing around exercise, particularly post-workout, may not be as critical for muscle growth as once believed. Daily intake and overall diet quality are likely more important for maximizing anabolic responses.

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Area of Science:

  • Sports Nutrition
  • Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Nutrient timing, focusing on protein and carbohydrate intake around exercise, is a popular strategy.
  • Claims suggest nutrient timing significantly impacts body composition, potentially exceeding daily intake importance.
  • The post-exercise period is traditionally viewed as a critical 'anabolic window' for muscle repair and growth.

Purpose of the Study:

  • To review existing literature on nutrient timing's effects on post-exercise muscular adaptations.
  • To provide evidence-based nutritional recommendations for optimizing the anabolic response to exercise.

Main Methods:

  • Literature review of studies investigating nutrient timing and post-exercise adaptations.
  • Analysis of research challenging the traditional 'anabolic window' hypothesis.
  • Synthesis of findings to inform practical dietary recommendations.

Main Results:

  • Evidence directly challenges the classical view of a critical post-exercise 'window' for anabolism.
  • The importance and existence of this 'window' can be influenced by various factors.
  • Applicability of some nutrient timing research is questionable.

Conclusions:

  • The significance of the post-exercise 'anabolic window' is debated and may be less critical than total daily nutrient intake.
  • Practical, evidence-based recommendations should prioritize overall dietary patterns over strict timing.
  • Further research is needed to clarify the nuanced role of nutrient timing in maximizing muscle adaptations.